Engineering Questions with Answers - Multiple Choice Questions

# Machine Kinematics Questions and Answers – Classification of Kinematic Pairs

1 - Question

The pair is known as a higher pair, when the relative motion between the elements of a pair is
a) turning only
b) sliding only
c) rolling only
d) partly turning and partly sliding

Explanation: When the two elements of a pair have a line or point contact when relative motion takes place and the motion between the two elements is partly turning and partly sliding, then the pair is known as higher pair.

2 - Question

Which of the following is a higher pair?
a) Belt and pulley
b) Turning pair
c) Screw pair
d) Sliding pair

Explanation: Belt and pulley are higher pairs as the motion is partly turning and partly sliding between them.

3 - Question

When the connection between the two elements is such that only required kind of relative motion occurs, it is known as self-closed pair.
a) True
b) False

Explanation: When the two elements of a pair are connected together mechanically in such a way that only required kind of relative motion occurs, it is then known as self closed pair.

4 - Question

When the elements of a pair are kept in contact by the action of external forces, the pair is said to be a
a) lower pair
b) higher pair
c) self-closed pair
d) force-closed pair

Explanation: When the two elements of pair are not connected mechanically but are kept in contact by the action of external forces, the pair is said to be a forced-closed pair.

5 - Question

A pair of friction discs is an example of rolling pair.
a) True
b) False

Explanation: A pair of discs are higher pairs as the motion is partly turning and partly sliding between them.

6 - Question

The lower pairs are ___________ pairs.
a) self-closed pair
b) force-closed pair
c) screw pair
d) none of the mentioned

Explanation: When the two elements of a pair are connected together mechanically in such a way that only required kind of relative motion occurs, it is then known as self closed pair. The lower pairs are self closed pairs.

7 - Question

The cam and follower is an example of
a) sliding pair
b) rolling pair
c) lower pair
d) higher pair

Explanation: The cam and follower is an example of higher pair as it is kept in contact by the forces exerted by spring and gravity.

8 - Question

Which of the following is an example of higher pair?
a) Toothed gearing
b) Belt and rope drive
c) Ball and roller bearing
d) All of the mentioned

Explanation: None

9 - Question

An automobile steering gear is an example of
a) sliding pair
b) rolling pair
c) lower pair
d) higher pair

Explanation: None

10 - Question

A pair is said to be kinematic pair, if the relative motion between them is completely or successfully constrained.
a) True
b) False